JP2013502854A - Apparatus and method for searching for multi-carrier active set pilot - Google Patents

Abstract

An apparatus and method for detecting a pilot signal is described herein. The access terminal determines whether each pilot signal in its active set can be tracked. If it cannot be tracked, the access terminal adjusts the search window center associated with the untracked pilot to a position that allows tracking. In some aspects, a known search window center of tracked members of the same pilot group may be used.
[Selection] Figure 2

Description

  The present application relates generally to multi-carrier wireless communications, and more particularly to searching for and detecting pilot signals.

  Wireless communication systems are widely deployed to provide various types of communication (eg, voice, data, video, etc.) to multiple users. Such a system may be based on code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or other multiple access techniques.

  Multi-carrier communication systems employ multiple carriers for data transmission to a single endpoint. For example, a pilot can transmit to a transmitter (eg, a base station) to assist a receiver (eg, a terminal) in performing various functions such as channel estimation, timing and frequency acquisition, data demodulation, received signal strength measurement, and the like. Often transmitted to the receiver.

  A terminal may hand off from one base station to another. To enable such handoff, the terminal periodically searches for a base station on an alternative frequency. If the terminal detects a base station that can be a candidate for handoff, it can be added to the base station's terminal active set. The detected frequency may be one of a plurality of frequencies supported by the base station. However, if the terminal does not initially detect additional frequencies, the terminal may not be able to use those frequencies later. It would be desirable to have a method for searching and detecting multiple pilot frequencies supported by a particular base station.

  The following presents a simplified summary of such aspects in order to provide a basic understanding of one or more aspects. This summary is not an exhaustive overview of all contemplated aspects and does not identify key or critical elements of all aspects or delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

  According to some aspects, a method for detecting pilot signals in a multi-carrier network environment receives a traffic channel update message that includes two or more pilot signals to be included in an active pilot set at an access terminal. Determining whether the access terminal stores a search window for tracking each of the two or more pilot signals; and wherein the access terminal is one or more of the pilot signals If it is determined that the search window for is not stored, one or more search window centers are arranged to allow one or more pilot signals to be tracked. Assigning to a pilot signal.

  According to some aspects, an apparatus for detecting a pilot signal in a multi-carrier wireless network is configured to receive a traffic channel update message that includes two or more pilot signals to be included in an active pilot set. A receiver, a pilot detector for maintaining one or more sets of pilot signals, and a search window that allows each of the two or more pilot signals to be tracked Determining whether each of the pilot signals is stored and determining that one or more of the pilot signals do not have a stored search window; Allows one or more pilots to be centered in the search window Provided searched configured to perform and assigning to the signal window calculator and (search window calculator).

  According to some aspects, a method for assigning pilot signals in a multi-carrier wireless network indicates one or more potential pilot signals to be included in an active pilot set associated with an access terminal in an access network. Receiving a route update message and transmitting to the access terminal a traffic channel update message that includes two or more pilot signals to be included in the active pilot set, the access terminal comprising two or more pilots Determining whether each of the signals is associated with a search window that allows tracking of the pilot signal and determining that no search window is associated with one or more of the pilot signals; One or more of the placed search window centered in order to be able to track the pilot signal is assigned to one or more pilot signals can not be tracked.

  According to some aspects, an apparatus for assigning pilot signals is adapted to receive a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal. A traffic channel allocation manager for determining one or more pilots to be included in the active pilot set from the route update message, and two or more to be included in the active pilot set A transmitter for transmitting a channel update message including a pilot signal, wherein at least one of the two or more pilot signals was not previously detected by the access terminal, the access terminal comprising: Pilot signal by access terminal The placed search window centered to allow it to be tracked, assigned to at least one of the pilot signals have not been detected before.

  To the accomplishment of the foregoing and related ends, one or more aspects comprise the features fully described below and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are indicative of only a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.

  The disclosed aspects described below in conjunction with the accompanying drawings are provided to illustrate the disclosed aspects and not to limit the disclosed aspects, and like designations indicate like elements.

1 is a block diagram of a wireless communication system in accordance with various disclosed aspects. FIG. 4 is a simplified block diagram illustrating two network sectors in accordance with various disclosed aspects. FIG. 7 is a block diagram of an access terminal in accordance with various disclosed aspects. 1 is a block diagram of a base station in accordance with various disclosed aspects. 6 is a flowchart illustrating an example pilot signal detection process in accordance with various disclosed aspects. FIG. 7 is a call flow diagram illustrating an exemplary pilot detection communication flow in accordance with various disclosed aspects. FIG. 10 is an illustration of an example system that detects pilot signals in accordance with various disclosed aspects. FIG. 10 is an illustration of an example system that assigns pilot signals in accordance with various disclosed aspects.

  Next, various aspects will be described with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It will be apparent, however, that such aspect (s) can be practiced without these specific details.

  Next, an apparatus and method for detecting a pilot signal will be described. The timing for carriers detected by the device can be used to center the search window for neighboring carriers that were not previously detected. FIG. 1 illustrates a wireless communication network 100 in which various disclosed aspects can be implemented. One or more access terminals (AT) 110 may access services of core network 130 via access network (AN) 120. As indicated by arrows 115, each AT 110 may communicate with the AN 120 via one or more channels at different frequencies on the forward and / or reverse links.

  The AN 120 may provide an interface from the AT 110 to the core network 130 and route data between the AT 110 and the core network. AN 120 may also perform various radio access and link maintenance functions. The AN 120 may include and / or implement functions such as a base station controller (BSC), base station transceiver (BTS), Node B, and so on. The AT (s) 110 may include, for example, a wireless phone, laptop computer, cellular phone, personal digital assistant (PDA), and / or other wireless device. Core network 130 may support one or more standards such as, for example, cdma2000, W-CDMA, IS-95, and / or other multi-carrier standards.

  Access network 120 may serve as an interface for ATs within a predefined service area or cell. According to some aspects, the access network and / or cell may be divided into multiple sectors 122. In some aspects, each sector 122 may be associated with a base station for servicing the sector. In other aspects, a single base station may serve multiple sectors. An exemplary access network 200 is shown in FIG.

  As shown in FIG. 2, the AN 200 may include a first sector 210 and a second sector 220. Although only two sectors are shown, AN 200 may include any number of sectors. Each sector 210, 220 may include a base station. Sector 210 may include base station 212, while sector 220 may include base station 222.

  A pilot signal or pilot is a reference signal broadcast by the base station. The AT may detect the pilot and use the detected pilot to connect to the BS. In a multicarrier system, one or more pilots may be associated with a base station or sector. The pilot may be specified by an ordered pair comprising a pseudo random number (PN) offset and a channel indicator. As shown in FIG. 2, BS 212 may be associated with a single pilot 214 that may be specified by an ordered pair (C0, PN1). BS 222 is designated by a first pilot 224 designated by an ordered pair (C0, PN2), a second pilot 226 designated by an ordered pair (C1, PN2), and an ordered pair (C2, PN2) A third pilot 228 may be associated. A pilot group may be formed from two or more pilots that have the same PN offset and are in the same sector. For example, pilots 224, 226, and 228 may belong to the same pilot group because each has the same PN offset PN2.

  AT 230 may be configured to communicate with BS 212 and / or BS 222. That is, AT 230 may be configured to detect pilots broadcast by BS 212 and / or BS 222. The AT 230 may maintain multiple sets of pilots, such as an active set, a candidate set, a neighbor set, and a remaining set, for example. The active set may identify the base station or sector with which the AT is communicating. The candidate set may identify base stations or sectors for which pilots have been received at the AT with sufficient signal strength but have not been put into the active set by the base station. The neighbor set identifies base stations or sectors that may be candidates for establishment of communication with the subscriber station. The remaining set identifies base stations or sectors in the system that are not part of any of the other sets.

   When communication is initially established, the AT 230 may communicate through the first base station, and its active set may include only the pilot signal of the first base station. For example, AT 230 may initially communicate through BS 212 and may include pilot signal 214 in the active set. The AT 230 may periodically search for its neighbors and remaining pilot sets. If AT 230 detects a strong pilot, the pilot may be promoted to a candidate set and reported to the AN. The AN may decide to add the pilot to the AT 230 active set. For example, AT 230 may detect pilot 224 and AN may add the pilot to AT 230's active set. Even if pilots 226 and 228 belonging to the same pilot group as pilot 224 have not been detected by AT 230, the AN may add these pilots further.

  A search window may be associated with each pilot set (active, candidate, neighbor, and remaining). The search window shows the distance (in chips) from a given reference point, such as the current location of the AT, for example. In conventional access terminals, if pilots that belong to the same pilot group as the detected pilots are added to the AT's active set, the AT will locate the pilot if they are outside the active set search window. It may not be possible to do. Thus, the AT cannot take advantage of the throughput improvements associated with communicating through all pilots in the pilot group. For example, assume that an AT has a neighbor set search window of 100 chips and neighbor pilots are detected at 70 chips. The detected neighbor pilot belongs to a pilot group comprising two additional pilots. Once a neighbor pilot is detected, after the neighbor pilot has moved to the active set, the AT may record the location of the neighbor pilot and use that location to center the search for that neighbor pilot. That is, the AT may be configured to search for detected pilots using an active set search window. The search may be centered on the position of a previously detected pilot. The AT may track the detected pilots but may not be able to detect two additional pilots belonging to the pilot group. This is because only the location of the pilot where the AT was detected was recorded. Thus, when searching for the other two pilots in the pilot group, the search remains centered on the current location of the AT. However, if the active set is configured to have a search window of 60 chips, for example, the search center was not recorded for those pilots, so the AT locates two additional pilots in the pilot group. It will not be possible. If a new search center has not been set, the AT attempts to search for a pilot using its current location. In this example, the search will fail because the pilot's location is outside the active search window.

  FIG. 3 illustrates an example AT 300 that incorporates various disclosed aspects that enable the use of all pilots in a pilot group. Mobile device 300 is tuned to receive signals from, for example, a receive antenna (not shown), perform operations typical of the received signals (eg, filtering, amplification, down-conversion, etc.) and obtain samples. A receiver 302 may be provided for digitizing the received signal. AT 300 may also include a demodulator 304 that can demodulate received symbols and provide them to processor 206. The processor 306 may analyze one or more of the AT 300, a processor dedicated to analyzing information received by the receiver 302 and / or generating information for transmission by the transmitter 316 operably coupled to the modulator 312. A processor that controls the components and / or a processor that analyzes information received by the receiver 302, generates information for transmission by the transmitter 316, and controls one or more components of the AT 300. .

  AT 300 is operatively coupled to processor 306 and may store data to be transmitted and received, information related to network connectivity, and / or data to be any other suitable information. A memory 308 may further be provided. Memory 308 may further store protocols and / or algorithms related to network connectivity or other functions performed by AT 300. It should be appreciated that the memory 308 can be either volatile memory or non-volatile memory, or can include both volatile and non-volatile memory. By way of example, and not limitation, non-volatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM), which acts as external cache memory. By way of example and not limitation, RAM can be synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), sync link DRAM (SLDRAM), and Many forms such as a direct RAM bus RAM (DRRAM) are available. The memory 308 shall include, without limitation, these and any other suitable type of memory.

  As explained above, an AT, such as AT 300, may maintain a list of pilot signals including an active set, a candidate set, and a neighbor set. Memory 308 may store one or more pilot tables 310 for storing a list of pilot signals.

  The processor 306 can further be operatively coupled to the pilot detector 318 and the search window calculator 320. Pilot detector 318 may be configured to monitor the communication channel to detect and measure pilot signals. Pilot detector 318 may generate a set of active, candidate, neighbor, and remaining pilots and allow storage of the pilot set in pilot table 310.

  The search window can be used to determine the pilots to be included in each set. Search window calculator 320 may be configured to set search window sizes for active, candidate, neighbor, and remaining pilot sets. Search window calculator 320 may also be configured to determine whether an active search window is set to track each active pilot in the set. If the pilot is not tracked, search window calculator 320 may be configured to adjust the search window. For example, for pilots belonging to the same pilot group, search window calculator 320 may set the search window for untracked members of the pilot group to the search window center of tracked pilots in the same pilot group.

  FIG. 4 illustrates an example system 400 for assigning traffic channels and pilots in accordance with various disclosed aspects. System 400 comprises a base station 402 (eg, access point, femtocell,...), And base station 402 receives signal (s) from one or more mobile devices 404 through multiple receive antennas 406. And a transmitter 424 that transmits to one or more mobile devices 404 through a transmit antenna 408. Receiver 410 can receive information from receive antenna 406 and is operatively associated with a demodulator 412 that demodulates received information. Demodulated symbols are analyzed by a processor 414, which can be similar to the processor described above with respect to FIG. 3, which is responsible for information related to channel assignments and / or the various described herein. Coupled to a memory 416 that stores any other suitable information related to performing actions and functions. Processor 414 is further coupled to a traffic channel assignment manager 416 that can provide a list of pilot signals to be included in the AT active pilot set.

  According to an example, base station 402 can receive a route update message from one or more of AT (s) 404. Traffic channel assignment manager 418 may determine one or more pilots from route update messages to be included in the active pilot set associated with the AT (s). Although illustrated as separate from processor 414, traffic channel assignment manager 418, demodulator 412, and / or modulator 422 may be part of processor 414 or multiple processors (not shown). I want to understand what I can do.

  FIG. 5 is a flowchart illustrating an example pilot acquisition method in accordance with various disclosed aspects. As shown at 502, the AT receives an initial pilot assignment from the BS. This allows the AT to establish communication with the BS. According to some aspects, pilot assignment may be performed in response to a connection request message from the AT.

  As shown at 504, the AT periodically searches for neighboring pilots that may have been associated with the same or different BSs. The AT may search for neighboring pilots within a given neighbor search window. According to some aspects, the neighbor search window is configured by the AT. In other aspects, it may be defined by the BS. A search window may be defined, for example, as the number of chips from a given reference point. For example, the AT may define a search window for pilots in a neighbor set as a given number of chips from the AT's current location.

  At 506, a determination is made as to whether the detected neighbor can be a candidate for inclusion in the active set. According to some aspects, the AT may measure the signal strength of the detected neighbor to determine if it exceeds a predefined threshold. If so, each pilot may be placed in the AT candidate set. Otherwise, the AT may continue to monitor neighbors periodically.

  If the neighbor pilot is moved to the candidate set, the AT sends a route update message to the BS as shown at 508. The route update message may identify all pilots in the AT's active set and those in its candidate set. According to some aspects, the route update message may also include those pilots in the AT neighbor set. In addition to the pilot identification information, the route update message may also include the detected signal strength.

  The BS may review the route update message and determine which pilot should be in the AT's active set based on predefined criteria. For example, the BS may be determined based on the detected signal strength. The BS sends a traffic channel update (TCA) message to the AT indicating those pilots to be put into the active set, and the AT receives the TCA message as shown at 510. The AT then stores the indicated pilot in its active set.

  As shown at 512, the AT determines whether the search window center for all pilots in its active set is being tracked. If so, the AT may communicate via any of the pilots in its active set. In general, the AT will know the location of all pilots it has previously detected. Thus, it can track the location of the pilot by assigning a search window centered on a known location. However, for pilots that belong to a pilot group in which only representative pilots are tracked, the AT does not have an updated reference point for tracking pilots that were not previously detected in the group. If the pilot location is outside the initial active search window, the AT may not be able to locate such pilot so that the search can be centered on the AT's current location. More specifically, the AT cannot give a new search window center because the AT did not record a location associated with a pilot that was not previously detected.

  As shown at 516, if the search window center is not tracked for pilots in its active set, the AT determines which pilot group the pilot belongs to. As explained above, pilots belonging to the same pilot group have the same PN offset. As shown at 518, the AT sets the search window center of the untracked pilot to the search window center of the corresponding tracked pilot group member. Thus, the AT can then locate the pilot and can utilize all pilots in the pilot group. This may improve AT throughput by allowing the AT to utilize one or more of the pilots not previously tracked.

  FIG. 6 is an exemplary call flow diagram illustrating communication between an AT and an AN (or an AN base station). As shown at 602, an active set (ASet) including a first pilot (C0, PN1) is first associated with the AT. An AT may also have one pilot, pilot (C0, PN2), in its neighbor set (NSet). Neighboring pilots may have been detected by the AT or supplied by the AN.

  As shown at 604, while monitoring both pilots, the AT may be a candidate for the NSet pilot (C0, PN2) to add to its active set based on one or more predetermined criteria. Judge that. The AT may then move the pilot to its candidate set (CSet). As shown at 606, the AT sends a route update message to the AN identifying its stored / detected pilot. Therefore, in this example, the route update message includes pilots (C0, PN1) and (C0, PN2). The route update message may also include one or more parameters associated with each pilot, such as detected signal strength, for example.

  As shown at 608, the AN determines whether the pilot reported in the route update message should be included in the AT's active set based on one or more predefined conditions. For example, the AN may determine whether a pilot should be included in the active set based on a signal strength threshold or any other parameter. Upon determining which pilots should be put into the AT's active set, the AN sends a traffic condition assignment (TCA) message to the AN that specifies those pilots to be stored in the active set.

  According to this example, pilot (C0, PN2) may belong to a pilot group that also includes pilots (C1, PN2) and (C2, PN2). Although not previously detected by the AT, the AN may include all pilots belonging to the same group as the detected pilot group in its TCA message. As shown at 610, the AT determines for each pilot identified in the TCA message whether its search window center is being tracked. In step 612, the AT updates the search window center as needed for those pilots that are not being tracked, as described above with respect to FIG.

  It should be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For hardware implementation, the processing unit can be one or more application specific integrated circuits (ASICs), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays. (FPGA), processor, controller, microcontroller, microprocessor, other electronic units designed to perform the functions described herein, or combinations thereof.

  Embodiments may be stored on a machine-readable medium, such as a storage component, when implemented in software, firmware, middleware or microcode, program code or code segments. A code segment can represent a procedure, function, subprogram, program, routine, subroutine, module, software package, class, or any combination of instructions, data structures, or program statements. A code segment may be coupled to another code segment or a hardware circuit by passing and / or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc.

  For software implementations, the techniques described herein may be implemented using modules (eg, procedures, functions, etc.) that perform the functions described herein. Software code may be stored in a memory unit and executed by a processor. The memory unit may be implemented within the processor or external to the processor, in which case it may be communicatively coupled to the processor by various means as is known in the art.

  With reference to FIG. 7, illustrated is a system 700 that detects pilot signals in a multi-carrier network. For example, system 700 can reside at least partially within an access terminal. It should be appreciated that the system 700 is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (eg, firmware). . System 700 includes a logical grouping 702 of electrical components that can act in conjunction. For example, logical grouping 702 can include a module 704 for receiving a traffic channel update message that includes two or more pilot signals to be included in an active pilot set.

  Further, logical grouping 702 can comprise a module 706 for determining whether each of two or more pilot signals can be tracked. Further, when the logical grouping 702 determines that one or more of the pilot signals cannot be tracked, a search window center arranged to allow tracking of the one or more pilot signals. A module 708 for assigning to one or more pilot signals that cannot be tracked. Further, system 700 can include a memory 710 that retains instructions for executing functions associated with electrical components 704, 706, and 708. Although shown as being external to the memory 710, it should be understood that one or more of the electrical components 704, 706, and 708 can be internal to the memory 710.

  With reference to FIG. 8, illustrated is a system 800 that assigns pilot signals in a multi-carrier network. For example, system 800 can reside at least partially within an access network. As shown, system 800 includes functional blocks that can represent functions implemented by a processor, software, or combination thereof (eg, firmware). System 800 includes a logical grouping 802 of electrical components that receive and process messages. Logical grouping 802 can include a module 804 for receiving a route update message indicating one or more potential pilot signals to be included in the active pilot set. Moreover, logical grouping 802 can include a module 806 for transmitting a channel update message to an access terminal that includes two or more pilot signals to be included in the active pilot set. In this regard, the access terminal can determine whether each of the two or more pilot signals can be tracked and can determine that one or more of the pilot signals cannot be tracked. A search window center arranged to enable tracking of a plurality of pilot signals is assigned to one or more pilot signals that cannot be tracked. Further, system 800 can include a memory 806 that retains instructions for executing functions associated with electrical components 804 and 808. Although shown as being external to memory 808, it should be understood that electrical components 804 and 806 can reside within memory 808.

  The terms “component”, “module”, “system”, etc. as used in this application are computer related, such as but not limited to hardware, firmware, a combination of hardware and software, software, or running software. It contains the following entities. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and / or thread of execution, and one component can be located on one computer and / or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. These components include one such as data from one component that interacts via signals with another component in the entire network such as the Internet using local systems, distributed systems, and / or other systems. Or it may communicate via a local process and / or a remote process, such as by a signal having multiple data packets.

  Further, various aspects related to a terminal that can be a wired terminal or a wireless terminal are described herein. A terminal is a system, device, subscriber unit, subscriber station, mobile station, mobile, mobile device, remote station, remote terminal, access terminal, user terminal, terminal, communication device, user agent, user device, or user equipment ( UE). A wireless terminal can be a cellular phone, satellite phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless connectivity, computing device, or wireless It may be another processing device connected to the modem. Further, various aspects related to the base station are described in this specification. A base station may be utilized for communicating with wireless terminal (s) and may also be referred to as an access point, Node B, or some other terminology.

  Further, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless otherwise specified, or unless otherwise apparent from the context, the phrase “X uses A or B” shall mean any natural inclusive substitution. That is, the phrase “X uses A or B” is satisfied either when X uses A, when X uses B, or when X uses both A and B. . Further, the articles “a” and “an” as used in the present application and the appended claims generally refer to “one or more” unless the context clearly indicates otherwise. Should be construed as meaning.

  The techniques described herein may be used for various wireless communication systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other systems. The terms “system” and “network” are often used interchangeably. A CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000. UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA. In addition, cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM). OFDMA systems include Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (WiFi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE802.20, Flash-OFDM, etc. Wireless technology may be implemented. UTRA and E-UTRA are part of the Universal Mobile Telecommunication System (UMTS). 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). In addition, cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). Further, such wireless communication systems include unpaired spectrum, 802. It may further include a peer-to-peer (eg, mobile-to-mobile) ad hoc network system that often uses xx wireless LAN, BLUETOOTH®, and any other short-range or long-range wireless communication techniques.

  Various aspects or features are presented in connection with systems that can include a number of devices, components, modules, and the like. It is understood and understood that various systems may include additional devices, components, modules, etc. and / or may not include all of the devices, components, modules, etc. discussed in connection with each figure. I want to be. A combination of these approaches can also be used.

  Various exemplary logic, logic blocks, modules, and circuits described with respect to the embodiments disclosed herein are general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays. (FPGA) or other programmable logic device, individual gate or transistor logic, individual hardware components, or any combination thereof designed to perform the functions described herein. obtain. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors associated with a DSP core, or any other such configuration. It can also be done. Further, the at least one processor may comprise one or more modules operable to perform one or more of the steps and / or actions described above.

  Further, the methods and algorithm steps and / or actions described with respect to aspects disclosed herein may be implemented directly in hardware, implemented in software modules executed by a processor, or a combination of the two Can be implemented. A software module resides in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Can do. An exemplary storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. Further, in some aspects, the processor and the storage medium may reside in an ASIC. Further, the ASIC can reside in the user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal. Further, in some aspects, method or algorithm steps and / or actions may be incorporated into a computer program product, one or any combination of code and / or instructions on a machine readable medium and / or computer readable medium, Or it can reside as a set.

  In one or more aspects, the functions described may be implemented in hardware, software, firmware, or combinations thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and computer communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer readable media can be RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or desired program in the form of instructions or data structures. Any other medium that can be used to carry or store the code and that can be accessed by a computer can be provided. Any connection may also be referred to as a computer readable medium. For example, the software can use a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, wireless, and microwave, from a website, server, or other remote source When transmitted, coaxial technologies, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the media definition. Discs and discs used in this specification are compact discs (CD), laser discs, optical discs, digital versatile discs (DVDs), floppy discs (discs). Includes a registered trademark disk and a Blu-ray registered disk, the disk normally reproducing data magnetically, and the disk is usually optically lasered with data To play. Combinations of the above should also be included within the scope of computer-readable media.

  While the above disclosure has discussed exemplary aspects and / or embodiments, various changes and modifications can be made without departing from the scope of the described aspects and / or embodiments as defined by the appended claims. Note that can be done here. Furthermore, although elements of the described aspects and / or embodiments may be described or claimed in the singular, the plural is contemplated unless expressly stated to be limited to the singular. . Moreover, all or part of any aspect and / or embodiment may be utilized with all or part of any other aspect and / or embodiment, unless otherwise specified.

Claims (22)

A method for detecting a pilot signal in a multi-carrier network environment, comprising:
Receiving at the access terminal a traffic channel update message that includes two or more pilot signals to be included in the active pilot set;
Determining whether the access terminal stores a search window for tracking each of the two or more pilot signals;
If the access terminal determines that it does not store a search window for one or more of the pilot signals, it is arranged to allow the one or more pilot signals to be tracked. Assigning a search window center to the one or more pilot signals.   Determining whether the access terminal stores a search window for tracking each of the two or more pilot signals determines whether the pilot signal was previously detected and stored by the access terminal. The method of claim 1, comprising determining.   The one or more of the pilot signals for which the access terminal does not store a search window belong to a pilot group, and the pilot group includes at least one pilot signal for which the access terminal stores a search window. The method of claim 1 comprising. The assigning is
The access terminal does not store a search window and the one or more pilot signals belonging to the pilot group are known associated with members of the pilot group for which the access terminal stores a search window. The method of claim 3, further comprising assigning a search window center.   The method of claim 3, wherein each member of the pilot group is associated with a common pseudo-random number (PN) offset. An apparatus for detecting a pilot signal in a multi-carrier wireless network comprising:
A receiver configured to receive a traffic channel update message including two or more pilot signals to be included in the active pilot set;
A pilot detector for maintaining one or more sets of pilot signals;
Determining whether a search window that allows tracking each of the two or more pilot signals is stored for each of the two or more pilot signals; and one or more of the pilot signals or If it is determined that the plurality does not have a stored search window, the one or more pilot signals are arranged in a search window center arranged to allow the one or more pilot signals to be tracked. And a search window calculator configured to assign to the apparatus.   The apparatus of claim 6, wherein a search window calculator is further configured to determine whether each of the two or more pilot signals has been previously detected and stored by the access terminal.   7. The one or more of the pilot signals that do not have a stored search window belong to a pilot group, and the pilot group includes at least one pilot signal in which a search window is stored. apparatus.   The search window calculator stores a known search window associated with a member of the pilot group in which no search window is stored and the one or more pilot signals belonging to the pilot group are stored in the search window. The apparatus of claim 8, further configured to assign a center.   The apparatus of claim 8, wherein each member of the pilot group is associated with a common pseudo-random number (PN) offset. At least one processor configured to detect a pilot signal in a multi-carrier wireless network;
A first module for receiving a traffic channel update message including two or more pilot signals to be included in the active pilot set;
A second module for determining whether a search window for tracking each of the two or more pilot signals is stored;
If it is determined that a search window for one or more of the pilot signals has not been stored, the one or more search window centers that allow tracking of the one or more pilot signals are defined. And a third module for assigning to the pilot signals of the processor. A first code set for causing a computer to receive a traffic channel update message including two or more pilot signals to be included in the active pilot set;
A second code set for causing the computer to determine whether a search window is stored to track each of the two or more pilot signals;
If it is determined that a search window for one or more of the pilot signals has not been stored, the one or more search window centers that allow tracking of the one or more pilot signals are defined. A computer program product comprising a computer readable medium comprising: a third code set for causing the computer to assign a pilot signal of: Means for receiving a traffic channel update message including two or more pilot signals to be included in the active pilot set;
Means for determining whether a search window for tracking each of the two or more pilot signals is stored;
If it is determined that a search window for one or more of the pilot signals has not been stored, the one or more search window centers that allow tracking of the one or more pilot signals are defined. Means for assigning to a pilot signal of the apparatus. A method for assigning pilot signals in a multi-carrier wireless network comprising:
Receiving, in an access network, a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal;
Sending to the access terminal a traffic channel update message including two or more pilot signals to be included in an active pilot set;
The access terminal determines whether each of the two or more pilot signals is associated with a search window that allows the pilot signal to be tracked, and one or more of the pilot signals A search window center is assigned to the one or more pilot signals that enables tracking the one or more pilot signals.   15. The method of claim 14, wherein the one or more pilot signals not associated with a search window belong to a pilot group, and the pilot group includes at least one pilot signal associated with a search window.   The method of claim 15, wherein each member of the pilot group is associated with a common pseudo-random number (PN) offset. An apparatus for assigning pilot signals in a multi-carrier wireless network comprising:
A receiver configured to receive a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal;
A traffic channel assignment manager for determining from the route update message one or more pilots to be included in the active pilot set;
A transmitter for transmitting a channel update message including two or more pilot signals to be included in the active pilot set, wherein at least one of the two or more pilot signals has been previously transmitted by the access terminal. A transmitter that was not detected,
The apparatus wherein the access terminal assigns a search window center arranged to allow the pilot signal to be tracked by the access terminal to the at least one pilot signal not previously detected.   The apparatus of claim 17, wherein the at least one pilot signal not previously detected by the access terminal belongs to a pilot group comprising at least one pilot signal previously detected by the access terminal.   The apparatus of claim 18, wherein each member of the pilot group is associated with a common pseudo-random number (PN) offset. At least one processor configured to allocate pilot signals in a multi-carrier wireless network;
A first module for receiving a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal;
A second module for transmitting to the access terminal a traffic channel update message including two or more pilot signals to be included in an active pilot set;
The access terminal determines whether each of the two or more pilot signals is associated with a search window that allows the pilot signal to be tracked, and one or more of the pilot signals Assigning a search window center arranged to allow the one or more pilot signals to be tracked to the one or more pilot signals; Processor. A first code set for causing a computer to receive a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal;
A computer comprising a computer readable medium comprising: a second code set for causing the access terminal to transmit a traffic channel update message including two or more pilot signals to be included in an active pilot set to the computer. A program product,
The access terminal determines whether each of the two or more pilot signals is associated with a search window that allows the pilot signal to be tracked, and one or more of the pilot signals Assigning a search window center arranged to allow the one or more pilot signals to be tracked to the one or more pilot signals; Computer program product. Means for receiving a route update message indicating one or more potential pilot signals to be included in an active pilot set associated with an access terminal;
Means for transmitting to the access terminal a traffic channel update message including two or more pilot signals to be included in an active pilot set;
The access terminal determines whether each of the two or more pilot signals is associated with a search window that allows the pilot signal to be tracked, and one or more of the pilot signals Determining that the search window is not associated with the one or more pilots, wherein the one or more pilots are arranged to allow the one or more pilot signals that cannot be tracked to be tracked. A device assigned to a signal.

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